Harrow.



PATENTED- JUNE 30, 1903.

J. O. AVERY.

HARROW.

APPLICATION FILED JAN. 5. 1903.

H0 MODEL.

WITNESSES &

No. 732,33i.

Patented June 30,

PATENT OFFICE.

JAMES O. AVERY, OF PEORIA, ILLINOIS.

HAR ROW.

SPEGIFIGATION forming part of Letters Patent No. 732,331, dated June 30, 1903.

Application filed January 5,1903. -SerialNo.137,853.' (No model.)

To all whom it may concern.-

Be itknown that I, JAMES O. AVERY, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Harrows; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention pertains to improvements in harrow-tooth holders of that class in which the holder clamps the tooth against the toothbar of the harrow.

The object of the invention is to provide a simple and cheap tooth-holder; and the invention further relates to a particular construction and arrangement, as will be described in the following specification and'pointed outin the accompanying claims.

In the drawings presented herew th, Figure 1 is a perspective view of my tooth-holder shown in two portions. I Fig. 2 is a perspective view of a modified form of the holder. Fig. 3 is aplan View of a portion of the toothholder shown in the above figures.

In constructing harrows I prefer to employ angle-iron for the tooth-bar, as indicated by the letter A. In Fig. lit will be seen that this bar occupies a position by which the two limbs-thereof are placed at an angle of fortyfive degrees, so that the tooth (indicated by B) will stand perpendicular and engage with the extremities of said limbs. In said Fig. l the holder is shown in two portions, which are interchangeable, since one casting will answer for both. These portions are indicated by 0, being provided with the extremities D, in which are apertures for receiving the square tooth. These said apertures are so placed that one corner of the tooth is brought against the extremities of the limbs of the bar A, as will be understood. Said extremities D are horizontal and parallel with each other, and the under surface of the lower one and the top surface of the upper one are reinforced, as at E. The portions 0 approach each other at the rear of the bar A and terminate in the parallel extensions F, and a strengthening-web G is cast in the angle between the angling portions of C and the extension F, as shown. A bolt H suffices to clamp the two portions 0 upon the bar by passing throughF F, and the tighter the bolt is drawn the tighter the tooth is clamped to the bar, since in tightening such bolt the said portions 0 tend to move along the limbs of the bar A toward the apex of the latter, resulting in pulling the tooth against the extremities of said bar, so that slipping of said tooth is impossible. The thick portion E provides a larger bearing for the tooth and strengthens the heads D as well.

In Fig. 2 the portions 0 are identical with those of Fig. 1, except in this figure such portions are connected by means of a portion I, which is preferably semicircular in crosssection to conform to the rounding heads D and the reinforcements E. The inner surface is provided with a V-shaped groove to conform to half of the tooth-aperture in the heads D, so that the tooth may lie within said groove for half its thickness. This form of tooth-holder provides a larger bearingsurface for the tooth and makes a stronger job. It is evident, however, that the connecting portion I need not be of the exact form shown, since other shapes will answer the same purpose.

To my knowledge tooth-holders have not been constructed in the forms described, and

Therefore I claim- 1. In combination with the tooth-bar of a harrow and harrow-tooth, of the angling portions 0 constructed as shown, the same approaching one another, the parallel extensions F F at the rear of the tooth-bar, the

bolt H for clamping the latter extremities F F, the heads D parallel with one another and extending beyond the tooth-bar, there being square apertures therein for receiving the tooth, and the reinforcements E on the extreme ends of the said heads D substantially as shown and described.

2. In combination with the tooth-bar of a harrow and harrow-tooth, of the angling portions 0 constructed as shown and lying against the said tooth-bar and approaching one another toward the rear of said bar, the rearward extensions F F thereof, the bolt H for clamping such extensions together, the I In testimony whereof I afiix my signature forward parallel heads D of said portions 0, in presence of two witnesses. there being square apertures in said heads for receiving the tooth, the reinforcements JAMES AVERY 5 E of said heads, and the grooved portion I Witnesses:

all arranged substantially as set forth and L. M. THURLOW, described.

A. KEITHLEY. 

